[llvm] [RISCV] Rematerialize vmv.v.x (PR #107993)

[Luke Lau via llvm-commits]

lukel97 wrote:

> Thanks for the patch, it looks pretty good! One thing that I'm thinking about is that can you also add a precommit test for remat.ll so that I can see the difference between the original one and rematerialized one.

It should be precommitted in the PR itself, so you can see the diff if you go to files changed > changes from all commits.

I'm not sure what the convention is nowadays after the move to GitHub. Is precommitting directly to main preferred?

https://github.com/llvm/llvm-project/pull/107993